Any advice/information regarding the use of stimulant medication such as methamphetamine or cocaine and it's affect on lie detecting. I suppose my question stems from the excessive body movement or fidgety uncontrolled body motion and hyperverbal speech that is apparent in those under the influence of stimulants. Thanks!

The hard part would be deriving the baseline with and without stimulants. They may end up sabotaging any possibility to even start to look for red flags. Once someone gets chemicals in their system it might be harder to establish a baseline unless you try once they are intoxicated. In your line of work in law enforcement I could see how this would be very helpful, you'd need to have good observation to get what you need from someone under stimulants.

It may be harder to determine if someone is lying due to the fact that those drugs are classed as uppers and boosts a persons confidence. This in turn would create a false sense of security for the person and they may even believe the lies they are telling as true so therefore it is harder to detect clusters of red flags?

I am only putting forward a theory as I have not done any research on this topic but it is interesting.

You brought up a question that I had never even thought about, but it's so fascinating!! It would definitely be even more difficult to establish a baseline and read their nonverbal cues, especially depending on what kind of stimulant and how much they ingested.